Read Surah Al-Baqara 2:54: "and when Moses said unto his people: "O my people! Verily, you have sinned against yourselves by worshipping the calf; t..." Full Arabic text, English translation, and image generator.
وَإِذْ قَالَ مُوسَىٰ لِقَوْمِهِ يَا قَوْمِ إِنَّكُمْ ظَلَمْتُمْ أَنْفُسَكُمْ بِاتِّخَاذِكُمُ الْعِجْلَ فَتُوبُوا إِلَىٰ بَارِئِكُمْ فَاقْتُلُوا أَنْفُسَكُمْ ذَٰلِكُمْ خَيْرٌ لَكُمْ عِنْدَ بَارِئِكُمْ فَتَابَ عَلَيْكُمْ ۚ إِنَّهُ هُوَ التَّوَّابُ الرَّحِيمُ
and when Moses said unto his people: "O my people! Verily, you have sinned against yourselves by worshipping the calf; turn, then. in repentance to your Maker and mortify yourselves; this will be the best for you in your Maker's sight". And thereupon He accepted your repentance: for, behold, He alone is the Acceptor of Repentance, the Dispenser of Grace.